Stockpiling sounds like some crazy old military guy getting ready for armedgedon or something :LOL
We buy in bulk when on sale, too. Our food supply sounds much like queen bee's, but longer (although I'm SURE she didn't liste *everything* she's got in her storage!

I know what you're saying about storage, but it can be done. Amy D. (TWG) makes some good points about storage, like finding every single possible spot for it. All your food doesn't have to be in one place. Like somethings can be under the bed, etc.
We live in a single-wide trailer, so storage space is hard to come by. We have a small extra room that is for sewing, ebaying (so holds many boxes & shipping supplies & inventory), clothes hanging in the winter months (8 mos out of the year here

), and houses the chest freezer and the food pantry. DH made the food shelves custom. So they almost reach the ceiling and are quite deep. We have some bulk foods stored in the kitchen (smaller things like spices, some canned foods, etc.) and usually on top, hard-to-reach shelves (like that blasted one over the fridge!). We also have food under my bed (also custom built by DH to be obnoxiously tall - he saw it as great for more storage - I was like HOW are the kids going to get up there??!!?? :LOL) Under the bed I have 50 lb. bag of soybeans (we used to have actual aseptic boxes of soymilk, now I just make my own), 25 lb. bag of oats, etc.
baby's awake... gotta go!
basically, it can be done! AT least to a small degree of what your storage will allow!